I'm building a website using susy fluid grid container. But some of my interface elements require fixed width. So having these settings:
In your susy global settings above you can add:
But in order to do so you need to include the column-width object as well.
So let's say you want to have each column with 40px width, using your example it goes like this:
$susy: ( columns: 12, ... math: static, column-width: 40px );
When you do
@include span instead of using % basis, it will use px base which as you want it as static.